<template>
  <div class="todo-footer">
    <label>
      <input type="checkbox" v-model="allCheck" />
    </label>
    <span>
      <span>已完成 {{ doneNum }}</span> / 全部 {{ totalNum }}
    </span>
    <button v-show="doneNum > 0" class="btn btn-danger" @click="del">
      清除已完成任务
    </button>
  </div>
</template>

<script>
export default {
  name: "TodoFooter",
  props: {
    doneNum: {
      type: Number,
      required: true,
    },
    totalNum: {
      type: Number,
      required: true,
    },
    updateTodos: {
      type: Function,
      required: true,
    },
    patchDelTodo: {
      type: Function,
      required: true,
    },
  },
  computed: {
    allCheck: {
      get() {
        return this.doneNum === this.totalNum && this.totalNum > 0;
      },
      set(val) {
        this.updateTodos(val);
      },
    },
  },
  methods: {
    del() {
      if (window.confirm(`您确认要删除所有已完成任务吗？`)) {
        this.patchDelTodo();
      }
    },
  },
};
</script>

<style>
/*footer*/
.todo-footer {
  height: 40px;
  line-height: 40px;
  padding-left: 6px;
  margin-top: 5px;
}

.todo-footer label {
  display: inline-block;
  margin-right: 20px;
  cursor: pointer;
}

.todo-footer label input {
  position: relative;
  top: -1px;
  vertical-align: middle;
  margin-right: 5px;
}

.todo-footer button {
  float: right;
  margin-top: 5px;
}
</style>